Specification guide
AMS7280 O-Rings
AMS7280 is an SAE Aerospace Material Specification for fluorocarbon (FKM, written FPM in the older naming) sealing rings: high-temperature fluid resistant, low compression set, 70 to 80 hardness, and still at revision F from 1992. The part standards AS3084 and AS3085 call it out on AS568 dash sizes, while AMS7276 is the active fluorocarbon document most new drawings use.
AMS7280 is an SAE Aerospace Material Specification for fluorocarbon (FKM type) sealing rings: high-temperature fluid resistant, low compression set, 70 to 80 hardness. Its 1970 base record prints the older name FPM for the same family. The part standards AS3084 (the AMS7280 seal) and AS3085 (the AMS7280 O-ring) call out this material. SAE's record shows it cancelled in January 1992 at revision F, yet it is the older of the two SAE fluorocarbon O-ring specifications still seen on drawings; AMS7276 is the current default, and both SAE titles are 70 to 80 hardness. This guide covers what the document is, the part numbers that carry it, how it relates to AMS7276 and the M83248 family, and what an RFQ needs to state.
What the document is
| Item | Value | Source |
|---|---|---|
| Full title (SAE) | Rings, sealing, fluorocarbon rubber, high temperature fluid resistant, low compression set, FKM type, 70 to 80 | SAE Mobilus record for AMS7280F, read 2026-09-27 |
| Status | Cancelled January 1992 at revision F; issued May 1970 | SAE Mobilus record for AMS7280F, read 2026-09-27 |
| Material | Fluorocarbon, FKM type (the 1970 base record prints FPM, the older designation) | SAE titles |
| Hardness | 70 to 80 | Document title |
| Part standards that invoke it | AS3084 (AMS7280 seal) and AS3085 (AMS7280 O-ring) | SAE records for AS3084A and AS3085A |
| Nearest current document | AMS7276 (active, revision J 2020; DLA ASSIST prints a non-government QPL for it) | SAE and DLA ASSIST records for AMS7276, read 2026-09-24 and 2026-09-27 |
The title carries no temperature; a specification is not an operating limit.
Part numbers and related callouts
| Part number form | Material specification | Hardness | Sizes | Note |
|---|---|---|---|---|
| AS3085 plus dash | AMS7280 | 70 to 80 A | Per the AS3085 sheet | The O-ring sheet for this material (SAE title) |
| AS3084 plus dash | AMS7280 | 70 to 80 A | Per the AS3084 sheet | The seal sheet for this material (SAE title) |
| AS3209, AS3208 plus dash | AMS7276 | 70 to 80 A | Per each sheet | The current default fluorocarbon callout; see the AMS7276 guide |
| M83248/1-XXX, AS83248/1-XXX | MIL-R-83248 Class 1, now AMS7276 | 75 A | Dash sizes | DoD cancelled M83248/1 in 2008 and pointed future purchases to AS3209 (boss sizes to AS3208); SAE later issued AS83248/1 (2014), which DoD adopted on 2025-11-03. See the M83248 guide |
| AS3581-XXX | AMS7259 | 85 to 95 A | Dash sizes | The high-hardness companion |
| AMS7278 callouts | AMS7278 (cancelled 1995, SAE record) | 70 to 80 A (SAE title) | Per the print | Still appears on older drawings; order to the print |
| 2-XXX (Parker®) and commercial FKM | none | Per the compound sheet | AS568 sizes | Same size system, no qualification; not a substitute without the print's permission |
What material is it, and what can it take?
Fluorocarbon (FKM) rubber, the family covered in the Viton® guide. The Parker O-Ring Handbook (ORD 5700) rates standard FKM compounds for continuous service from -26 C (-15 F) to 204 C (400 F), with low-temperature grades to -46 C; the qualified compound's own sheet governs. The title names the same property set as AMS7276: high-temperature fluid resistance with low compression set, so the seal keeps its force through long hot service. Where FKM fails (steam, ketones, amines, brake fluid) it fails under any of these documents; the chemical compatibility guide covers the media.
Why AMS7280 still appears on drawings
The document was first issued in 1970 and cancelled at revision F in 1992, which puts it on the drawings of airframes, engines and ground equipment designed through the 1970s and 1980s and still flying or in service. Drawings are not redrawn when a newer material specification appears, so a maintenance order for a 1980s program calls for AS3085-XXX in AMS7280 material long after new designs moved to AMS7276. AS3084 and AS3085 carry AMS7280 material as AS3208 and AS3209 carry AMS7276 (SAE titles). What the title promises is the property set the family is known for, high-temperature fluid resistance with low compression set, so the seal keeps its force through long hot service in fuel and oil. What the title does not promise is an operating temperature; the Parker handbook's caution applies to every document in this family.
AMS7280 or AMS7276: which one to quote?
| What the drawing says | What to supply | Why |
|---|---|---|
| AS3085-XXX or AMS7280, no alternate | An AS3085 part in AMS7280 material from a qualified manufacturer | The print governs; one qualified compound often serves several documents (Parker pairs V1164-75 with AMS7276 and AMS-R-83248) |
| AMS7280 "or equivalent" | AS3209 in AMS7276, with the cross-reference on the certificate | AMS7276 is the active document, with a non-government QPL per DLA ASSIST |
| M83248/1-XXX | M83248/1-XXX as the print names it, or AS3209 or AS83248/1 in AMS7276 where the print allows | MIL-R-83248 was cancelled in favor of AMS7276; for the /1 sheet, DoD's 2008 notice pointed future purchases to SAE AS3209 (boss sizes to AS3208), and SAE later issued AS83248/1 (2014), which DoD adopted on 2025-11-03 |
| 90 hardness or Class 2 | AS3581 in AMS7259 | AMS7280 and AMS7276 are 70 to 80 A documents |
| Fuel seal with cold-soak requirement | Ask about AMS7379 or AMS-R-83485 | Low-temperature fluorocarbon documents |
| Commercial equipment, no spec | A commercial 75 A FKM O-ring | No qualification needed; lower cost |
What should the RFQ state?
The part standard and dash number (AS3085-214), the quantity, whether AMS7276 material is an acceptable equivalent, the drawing revision if named, and the documentation required (certificate of conformance to the specification; the manufacturer's test report if the program requires it; lot traceability). State the quantity per size and the delivery destination, since qualified parts ship with paperwork per lot. The mil-spec O-ring chart lists the related documents and the AS568 chart the sizes.
How Conquest Seal supplies it
Parts to these documents are made by manufacturers on the relevant qualified products list, where the document has one; Conquest supplies them as a distributor and provides the certification paperwork (certificate of conformance naming the specification and, where the manufacturer issues one, the test report). Conquest's quality management system handles the order and the paperwork; it is not a product qualification and is unrelated to any QPL. See aerospace and defense sealing.
Viton is a trademark of The Chemours Company; Parker is a trademark of Parker Hannifin Corporation. No affiliation or endorsement is implied.
Sources
- Parker O-Ring Handbook ORD 5700, section 2.2, read 2026-09-14
- Parker O-Ring Handbook ORD 5700, Tables 8-3 and 8-4 (page 8-4, 8-5), read 2026-09-24
- AMS-R-83485
- AMS7259
- AMS7276
- AMS7278
- AMS7280
- AMS7379
- AS3084
- AS3085
- AS3208
- AS3209
- AS3581
- AS568
- AS83248
- MIL-R-83248
- SAE Mobilus
- SAE and DLA ASSIST document records for the specifications named, read September 2026
- SAE Mobilus records for AMS7280 (read 2026-09-24), AS3084A, AS3085A and AMS7278 (read 2026-09-25)
- DLA ASSIST records for SAE-AS3084 and SAE-AS3085, read 2026-09-25
- SAE Mobilus record for AMS7280F (the last revision, cancelled January 1992), read 2026-09-27
- DLA ASSIST record for SAE-AMS7276, read 2026-09-24
- DLA ASSIST: the MIL-R-83248/1A cancellation notice (Notice 5, 2008-07-24), read 2026-09-29, and SAE-AS83248/1 (ident 286630, adopted 2025-11-03), read 2026-09-25; SAE Mobilus current-revision record for AS83248/1A (issued December 2014), read 2026-09-27
Frequently asked questions
Is AMS7280 obsolete?
SAE's record shows AMS7280 cancelled in January 1992 at revision F, but older drawings still cite it; AMS7276 is the active document most new drawings use. Quote what the print names unless it allows the equivalent.
Why do some AMS7280 titles say FPM?
FPM is the older ISO-style designation for fluorocarbon rubber, and the 1970 base record's title prints it; the revision F title prints FKM, the ASTM D1418 designation for the same family.
What is the difference between AS3084 and AS3085?
The SAE titles: AS3085 is the AMS7280 O-ring sheet and AS3084 the AMS7280 seal sheet. The size tables sit in the sheets themselves, so send the dash number exactly as the print shows it.
Can one compound serve more than one fluorocarbon document?
Often yes: Parker's handbook pairs one 75 A compound (V1164-75) with AMS7276, AMS-R-83248 and MIL-R-83248 Class 1. The certificate names the document you ordered to.
What temperature is it good for?
The document is a materials and test specification. For the FKM family the Parker handbook range is -26 C to 204 C continuous; the qualified compound's sheet and the application govern.
How do I order an AS3084 or AS3085 size?
AS3085 is the O-ring sheet and AS3084 the seal sheet (SAE titles), and each sheet carries its own size list. Send the dash number exactly as the print shows it; a print that mixes the two is asking for two different seals.
What is the current revision of AMS7280?
The SAE record ends at revision F, dated January 1992, and its citation line records that date as the cancellation. The part standards AS3084 and AS3085 that call it out stand at revision A of June 2012, which SAE lists as stabilized; DLA ASSIST shows both active, adopted in December 2025.
What hardness does AMS7280 material carry?
70 to 80 Shore A, the same band as AMS7276 (both SAE titles). Parker's handbook pairs one 75 A compound (V1164-75) with AMS7276, AMS-R-83248 and MIL-R-83248 Class 1, which is one reason fluorocarbon documents are often quoted together.
Is a certificate required with an AMS7280 order?
Yes. A certificate of conformance ships with every order, naming the part number, the specification, the manufacturer, the lot, the quantity and the manufacturer's cure date; the manufacturer's batch test report can be requested where the program requires it. Qualification belongs to the compound maker, never to the distributor that stocks the part.
Related guides
Orders are handled under Conquest Seal's AS9100D quality management system, whose certificate scope includes distribution.
Send the part number and we quote it
Part number or drawing, compound if you know it, and the quantity. A Conquest representative reads every request and replies. Quotes answered within one business day. A person answers (714) 632-9830, Pacific business hours.
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